I am presently sixty-eight years of age and until a few years ago, I was unaware that others were having experiences that mirrored my own. My experiences seemed so personal and spiritual that it did not occur to me for quite some time that others might be having experiences so similar. 
 
My first experience was so traumatic that I could not tell anyone about it for some time and then only my wife. I was for some time concerned that I might be considered imbalanced or some sort of wacko. Though my experience contains many of the elements of what is described as “sleep  
paralysis”, I believe that my own “sleep paralysis” was the result of demonic assault or that sleep paralysis was the means used by demonic entities to attack me. The fear was always instantaneous as I would awaken to find myself paralyzed but aware of what I can only describe as a “presence” accompanied by a “tone” not unlike a 1,000 htz tone in a sound system that's feeding back and always so loud that I thought my head would burst. 
 
While I never saw any images or "beings", the room would always seem darkened with what I am constrained to describe as the presence of an “entity” that seemed to move closer and closer attempting to push its way into my mind or psyche. 
 
Words fail me in trying to describe the means I was using to resist the entity. The only way I can describe my efforts is to say that I found myself mentally or perhaps even spiritually “pushing” back against its attempt to enter me at whatever level. Finally when I felt I was losing  
in my efforts to repel the intrusion, I cried out to God and Christ to help me and immediately the attacks would begin to fade and within a few seconds, I was able to retake control of my whole body. If this was not an attack from a demonic entity, why would such an appeal always cause it to cease almost immediately? 
 
At those moments, I seemed exhausted from the incident(s) but also there would be such a sense of release, peace and comfort that I would almost immediately fall back into a restful uninterrupted sleep for the remainder of the evening. 
 
I have come to believe from my lifelong biblical studies that what I experienced was indeed a form of demonic attack that I'm sure could seem to many with certain backgrounds to be unquestionably alien for alien on some lever it defiantly was. It may be that these entities are able to induce what we call “sleep paralysis” and then from within that inducement, use it as a means or portal to attack the objects of their assault. These attacks would continue for a period of a few years during my late twenties and early thirties. 
 
As scripture admonishes, “...resist the Devil and he will flee from you.” This seems to have been the case as my subsequent resistance was always to invoke the name of Christ to repel the attacks and ultimately the attacks ceased altogether. I have now been free of these assaults  
for many years and rather than cause me any spiritual consternation, the attacks only served to drive me closer to the safety I found in my Lord and Savior Jesus Christ. 
 
I hope you find my experience useful in conjunction with the others. Feel free to openly use it or any of its elements with no attribution asked or required.